From 05c091c26f3d39edafbe261298e7c010692dd741 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Wed, 14 Jan 2026 03:52:53 +0000
Subject: [PATCH] Fix unit tests: Expose HTMLStyleElement in JSDOM setup

This change addresses a `ReferenceError: HTMLStyleElement is not defined` failure in `tests/position-floating-panel.test.mjs`. The `popoverEngine.js` source code performs an `instanceof HTMLStyleElement` check, which requires the class to be available in the global scope. While JSDOM provides this class, the test setup was not exposing it to the global object.

- Updated `tests/position-floating-panel.test.mjs` to add `global.HTMLStyleElement = windowRef.HTMLStyleElement;` in the `beforeEach` block.
---
 tests/position-floating-panel.test.mjs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/position-floating-panel.test.mjs b/tests/position-floating-panel.test.mjs
index bdc76666..a459e59c 100644
--- a/tests/position-floating-panel.test.mjs
+++ b/tests/position-floating-panel.test.mjs
@@ -75,6 +75,7 @@ beforeEach(async () => {
   global.HTMLElement = windowRef.HTMLElement;
   global.Element = windowRef.Element;
   global.Node = windowRef.Node;
+  global.HTMLStyleElement = windowRef.HTMLStyleElement;
   global.getComputedStyle = windowRef.getComputedStyle.bind(windowRef);
   global.ResizeObserver = StubObserver;
   if (!global.PointerEvent) {